Examine source code of Peaceful waterfall

{
  "name": "Peaceful waterfall",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Peaceful-waterfall.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(214, 149, 149, 1)",
      "toolbar": "rgba(136, 216, 219, 0.59)",
      "bookmark_text": "rgba(227, 141, 141, 1)",
      "toolbar_field": "rgba(230, 168, 129, 1)",
      "toolbar_field_text": "rgba(28, 62, 232, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b20b9d14-85d7-4de0-b2dd-3b066fbb422e}"
    }
  }
}